Which retail innovation, introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

The landscape of retail has evolved dramatically over centuries, from ancient markets to today's omnichannel experiences. But certain innovations fundamentally transformed how people shop and how merchants sell. Test your knowledge of retail history milestones that shaped commerce as we know it today. This question focuses on a revolutionary retail innovation that forever changed consumer behavior and set the stage for modern shopping experiences.

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Self-service grocery stores (Piggly Wiggly)
Department store catalogs (Sears)
Automated vending machines (Horn & Hardart)
Shopping malls (Country Club Plaza)